PCM Feature:
This battery pack applied special designed protection circuit: 
Over charge, Over discharge, Short circuit and over current protection.Prevent battery from fire and explosion.
Cell : 18650/2500mAh/3.7V  Branded cell,high energy and safety
MOSFET: Intelligent power switch,which keep the battery voltage in a stable range  
LED:      LED high illumination , environmental protection LED lamp
Package : PVC Casing
 
Schematic diagram:
Picture of Battery Pack:18650 -3P 3.7V 7500mAh 
Internal structure of 18650 cell